Heating system for driers.



I. M. JUSTICE.

HEATING SYSTEM FOR DRIERS.

APPLIOATION FILED MAILll, 1912.

Patented July 28, 1914.

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HEATING SYSTEM FOR DRIERS.

APPLIOATION FILED MAR-.11, 1012.

Patented July 28,1914.

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I. M. JUSTICE.

HEATING SYSTEM FOR DRIERS.

APPLICATION FILED MAR.11,1912.

Patented July 28, 1914.

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l Vi hwomo rHE NORRIS PETERS CO.. PHOTO-LITHO., WASHINGION. D. C.

I. M. JUSTICE.

HEATING SYSTEM FOR DRIERS.

APPLICATION FILED MAB..11,1012.

1,105,566. Patented July 28, 1914.

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FIE. 5 3 7 I II IIIIIIIIIIIIIIIII!I%//A 5a 5 m m I21 m F g glwuc'nto'a kW/mug UNITED TATES PATENT OFFICE.

ITI-IAMAR M. JUSTICE, OF DAYTON, OHIO.

HEATING SYSTEM FOR DRIERS.

To all whom it may concern Be it known that I, ITHAMAR M. JnsTIoE, a citizen of the United States, residing at Dayton, Ohio, have invented certain new and useful Improvements in Heating Systems for Driers, of which the following is a full, clear, and exact description.

My invention relates to a type of drier-s wherein air is heated and circulated around and among the objects to be dried, and while my improvements are applicable to driers in general, I will illustrate them in connection with a drier for clay products.

It is well known that to heat air it is necessary to bring it into contact with a heated solid. Therefore, an essential feature in a drier is a source of heat. This is usually a furnace, and one of the objects of my invention is to construct a furnace in such mannor as to heat the greatest possible area of solid surface with a given amount of fuel.

Another object is to bring the air into contact with as much of the heated surface of the furnace as possible.

A further object is to introduce air, preferably heated, at a point where, by mixing with unconsumed fuel gases a combustible mixture is formed, which burning increases the heating capacity of the furnace. These and other advantages are attained by the construction shown in the accompanying drawings, in which:

Figure 1 is an elevation of the discharging end of battery of driers. Fig. 2 is an elevation of the other end of the same battery. Fig. 3 is a longitudinal section on line 33, Fig. 1. Fig. l is a mutilated plan of the battery. The levels at which the several sections in this figure are taken are indicated by numbers and letters, the former referring to other figures and the latter to the particular section line on that figure. Fig. 5 is an enlarged elevation of the lower portion of two sections of the discharging end of the battery, with the front wall of one section removed. Fig. 6 is a section on line 66, Fig. 7 a section on line 7-7, and Fig. 8 a section on line 8--8 of Fig. 3. Fig. 9 is a transverse section on line 99, Fig. 5.

Similar numerals refer to similar parts throughout the several views.

Re erring more particularly to Fig. 2, the doors 2525-25 cover the openings to tunnels 26; each tunnel has a track on which cars carrying the clay products are run into Specification of Letters Patent.

Application filed March 11, 1912.

Patented July 28, 1914.

Serial No. 682,976.

the tunnels. When the products are dry, the cars are drawn out at the discharging end. Doors 27 close the discharging ends of the tunnels. Below the track at the discharging end of each tunnel a furnace 30 is located. This furnace has the usual combustion chamber, 31, grate 32, feed door 33 and ash pit 8 1-. When so equipped it is adapted to burn coal, wood, etc. .It is to be understood, however, that my invention is not limited in its application to furnaces burning the fuels mentioned. The products of combustion pass over a bridge wall into an expansion chamber 36, and from there into the fine 37. This fine, which is substantially horizontal, runs to the receiv ing end of the drier where it connects with a transverse horizontal line 38. This flue terminates at each end in a flue 39 which leads into the stack 40.

The expansion chamber is divided by a ballle wall 41., whereby the products of combustion are forced into the lower part thereof. It will be noted that the expansion chamber is quite large: This is to enable the products of combustion to expand and pass slowly through the chamber, which gives better opportunity for the walls of the chamber to take up the heat. Moreover, the chamber being large, its walls afford a large area of surface for heating the air which passes into the drier. The inlet and outlet being at the top of the expansion chamber, andv the baflle wall extending nearly to the bottom thereof, the products of combustion are brought into contact with a very large proportion of the inclosing wall.

At each side of the combustion el'iamber, at about the base of the arch which forms the dome, a tube 412 is embedded in the wall. One end of each tube is open to the atmosphere (see Fig. l) and the other end, after making a turn, opens into the space above the bridge wall 35. Air drawn in through these tubes becomes heated by the heat of the walls surrounding them. This heated air mixing with the unburned gases, forms a combustible mixture, which being ignited by the flames from the furnace, increases the heat in the expansion chamber.

The width of the furnace, expansion chamber, and fine is preferably made the same, and being narrower than the tunnel leaves a narrow space, 50, on each side thereof. A cover 51 extending from the top of the furnace to each tunnel wall converts tinuous opening beyond.

and

these spaces into air ducts. will be seen that the cover 51 is continuous for a considerable distance, beyond which it is pierced by openings 52. New referring to Fig. a it will be seen that the cover is finally discontinued, leaving the flue free standing in the space between the walls 53' of the tunnel.

The receiving end of each tunnel is pro vided with an opening 5 iinto the stack 40. Because of the tendency for hot air to rise and the stack being of considerable height, a suction is created which draws cold air into the ducts 50 through openings '55 at their front ends. This air is confined to the ducts by the cover 51 and in its passage there-through becomes heated by contact with the hot walls of the furnace, and expansion chamber. Baffle walls 56 are built into the ducts which compel the air to traverse a far longer course than it would if they were not there. Moreover, the air is thereby brought into contact with practically all of the surface of the furnace and chamber walls. A portion of the air passes up through the openings 52 and the remainder rises into the tunnel through the con- The support for the tracks in the tunnel being transverse bars 57 there is practically nothing to impede the circulation of air in the tunnel.

A. compartment is formed above the combustion chamber 31 by a wall 60 and cover 61; the former not quite reaching to the latter, an opening 62 is formed. Openings 63 in the front wall admit cold. air to the com partment, which becomes heated and passes out at opening 62. A partition formed by a batlie wall 64 built out from each tunnel wall partially divides the compartment and lengthens the course of the air through the compartment. The air which passes through this compartment supplies the portion of the tunnel above the expansion chamber not served by the air which enters at openings 1 Having stated the objects of my invention described a preferred construction whereby these objects are attained, it is to be understood that minor changes from the construction shown may be made while remaining within the scope of the invention described.

What I claim is as follows: i 1. In a heating system for drlers the combination of a heating element compr1sng: a

furnace, an expansion chamber which is di- -v1ded into two parts by a baffle wall, and a.

substantially horizontal flue, the three parts In Fig. 9 a

chamber above the furnace only havin of the heating element being in horizontal succession and bounded by rectilineal side walls; a horizontal air duct adjacent to and coextensive with each side wall, each wall forming one wall of the adjacent duct, an inlet for air at one end of each duct, and bailies extendin alternately upward from the bottom and downward from the top of each duct around which air must pass 111 traversing the ducts; the top of each duct having a succession of apertures begmmng at a point beyond where the flue taps the expansion chamber, the tops being entirely removed therebeyond.

2. In a heating system for driers a furnace having an upper chamber isolated from products of combustion, a pair of baffles extending toward each other from its sides and dividing the chamber into two parts whose .at the top of the rear wall of the chamber for the emission ofheated air.

3. in a heating system for driers the com.- binatlon of a heating element comprism z a furnace, an expansion chamber which is divided by .a battle wall into two parts, and a substantiallyhorizontal flue, the. three parts of the heating element being in horizontal succession and boundedby rectilineal side walls; a horizontal air duct adjacent to and coextensive with each side wall, eachwall forming one wall of the adj aeentduct, an inlet for air at one end of each duct, and battle walls extending alternately upward from the bottom and downward from the p 7 top of each duct around which airmust pass .in traversing the ducts, the too of each duct being. removed from a. point beyond where.

the flue taps the expansion chamber; and a a pair of batlies extending toward each ot ie from its sides and dividing the chamber into two parts whose only. communication is through a narrow space between the opposing edges of the batl'les, inlet apertures in the front wall of the chamber, one of them :close to each side wall, and a horizontal slitin the rear wall of the chamber for the emission of heated air.

lln testimony whereof I ailix my signature in the presence of two subscribing. witnesses.

. ITHAMARM. JUSTICE.

l Vitnesses: I

lVILLIAM C. THAYER, FELIX THOMAS.

Copies of this patent may be obtained. for five cents each, by addressing the Commissioner of Patents Washington, D. C. 

